Epidendrum concretum Jacquin, Enum. Syst. Pl. 30. 1760; Dendrorkis purpurea (Wight) Kuntze; Onychium flavescens Blume; Polystachya flavescens (Blume) J. J. Smith; P. pleistantha Kraenzlin; P. purpurea Wight; P. purpurea var. lutescens Gagnepain. Plants 10–29 cm tall. Pseudobulbs usually slightly compressed, ovoid to conic, 1–2 × 0.5–1.5 cm, with 2 or 3 nodes. Leaves 3–5, narrowly oblong or narrowly ovate-lanceolate, 7– 18 × 1.2–3.4 cm, base narrowed into a petiole and then decurrent into a sheath, apex obtuse or unequally shallowly 2-lobed. Inflorescence terminal, 3–10 cm, usually 1–4-branched; rachis ± narrowly winged, racemose, branches 1–2 cm, 3–8-flowered; floral bracts narrowly lanceolate to nearly subulate, 2–5 mm. Flowers pale yellow, small; pedicel and ovary 8–12 mm. Dorsal sepal subovate, 3.5–4 × 1.5–2 mm, obtuse; lateral sepals broadly ovate-triangular, ca. 4 mm wide at base. Petals linearoblanceolate or subcuneate, 2.5–3 × ca. 0.5 mm; lip 3.5–4 mm,base contracted into a short claw, 3-lobed; lateral lobes incurved, ovate-oblong to narrowly oblong, small; mid-lobe orbicular, margin undulate and irregularly erose, apex emarginate, with a thickened central part. Column ca. 1 mm, foot short. Capsule ellipsoid, 1.2–1.4 cm × 5–6 mm. Fl. and fr. Aug–Sep. Epiphytic on trees in dense forests or thickets; 600–1500 m. S Yunnan [Cambodia, India (including Nicobar Islands), Indonesia, Laos, Malaysia, Philippines, Sri Lanka, Thailand, Vietnam; Africa, subtropical and tropical America].